Finding the Fourth Proportional to 1,039.91, 1,434.56 and 708.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.91 : 1,434.56 = 708.53 : x
2. Step 2: Convert to fraction form
   1,039.91/1,434.56 = 708.53/x
3. Step 3: Cross multiply
   1,039.91x = 1,434.56 × 708.53
4. Step 4: Simplify right side
   1,039.91x = 1,016,418.08
5. Step 5: Solve for x
   x = 1,016,418.08/1,039.91
6. Step 6: Final answer
   x = 977.41